Role of liquid
sintering aids in the synthesis of SiAlON materials
Mandal B. and Das T.
Res. J. Chem. Environ; Vol. 25(7); 93-97;
doi: https://doi.org/10.25303/257rjce9321; (2021)
Abstract
The synthesis of dense sintered sialon with external additives selected from the
system Y2O3-AlN-SiO2 is described. The highest density (3.21g/cc) was achieved at
1750ºC at 90 min of sintering with 5 wt% additive. Non-oxide ceramic materials are
increasingly coming out as a potential candidate in engineering applications and
among them, sialon is one of the most important materials.
β-Sialon was first to be discovered in this class of compounds. It has an excellent
combination of thermal, mechanical and chemical properties. The degree of sialon
substitution increased with the amount of liquids, the YSiO2N crystalline phase
formed concurrently. Strength degradation occurred above 1000ºC.The fracture toughness
of the material sintered with a lower amount of sintering aid remained relatively
unchanged to 1200ºC.
